Thermostat



S. IVI. UDALE.

THERMOSTAT.

,wiLlcArmN FILED OCT. 15.1920.

Patend Mar. 1", 1921 www@ INVENTOR ATTORNEY UNITED STATES STANLEY M.UDALE, 0F DETROIT, MICHIGAN, ASSIGNOR.T0 GEORGE M. HOLLEY, OF

DETROIT, MICHIGAN.

THERMOSTAT.

Specication of Letters Patent.

Patented Mar. 15, 1921.

Original application led December 29, 1919, Serial No. 348,128. Dividedand this application filed October 15, 1920.

'l 'o al! y:lf/1,0m. it may conce/m.'

Be it known that I, STANLEY M. UDALE, citizen of the United States,residing at Detroit, in the county of Wayne and State of Michigan, haveinvented' certain new and useful Improvements in Thermostats, (dividedapplication of U. S. Serial No.

348,128,) of which the following is a specification.

This invention relates to thermostatic means for controlling the flow offuel from an orifice Specifically adapted to supply an internalcombustion engine so that the fuel supply may be regulated so as torespond to the temperature changes within the mixing chamber where thefuel and air are mixed.

This thermostat is also adapted for controlling the flow of fluidsgenerally.

Figure l shows the general arrangement of a conventional carbureter towhich the no vel thermostat is applied.

Fig. 2 shows a detail construction of the thermostat.

In Fig. l (l) is the air entrance to a carbureter supplied with fuelfrom a reservoir (2) through a fuel orifice (3) controlledI by a needlepoint (4), which needle,is su ported by the carbureter cover (5) and bythe interior-ly threaded projection (G). The fuel sprays into the mixingchamber (7), with which the needle valve (4) is concentric. i

In Fig. 2 the needle itself is shown, and consists of a piece (8) with adrilled hole through, into which tits a rod (9) of hard rubber, Thisrubber carries the needle point (4) and is protected from the gasoleneby the cap (l0). The operation of the thermostat is as follows: v

The needle responds to the temperature Serial N0. 417,274.

changes due to the large co-eiliciency of the expansion of the rubberrelative to the metal piece (8).

For the reason that hot air is arranged to enter the carbureter at (1)the needle responds to themixture temperature rather than to thetemperature of the liquid fuel. The hot air is obtained from the exhaustpipe, the temperature of which increases more rapidly than that of theliquid, hence an added quantity of fuel is supplied during the periodwhen the engine is warming up, which is the period during which anincreased supply of fuel is required.

This device therefore automatically re sponds to temperature changes ofthe air supply. To a less degree it responds to the temperature of theliquid fuel sprayed out of the orifice f Obviously this thermostat maybe applied to similar devices where fluids have to be controlled withrelation to temperature.

What I claim is:

l. ln a thermostat, an adjustable rod, a drilled passage within saidadjustable rod, a rod of hard rubber within said passage anchored at oneend of said rod and a needle point attached to the hard rubber at theother end.

2. ln a thermostat, an adjustable rod, a drilled passage within saidadjustable rod, a rod of hard rubber within said passage anchored at oneend to said rod and a needle point attached to the hard rubber at theother cn'd and a cap protecting thecnd ot' rubber rod.

In testimony whercotl I atlix my signature.

"STANLEY M. UDALE.

